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Explain why NH_(3) is basic while BiH_(3) is only feebly basic ? |
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Answer» Solution :The atomic SIZE of nitrogen (atomic radius = 70 pm) is less than that of bismuth (atomic radius = 148 pm). As a result, electron density on the nitrogen atom is greater than that on bismuth atom . It means that electron releasing TENDENCY of ammonia is more than `BiH_(3)`. Therefore, `NH_(3)` is basic while `BiH_(3)` is only feebly basic. NOTE : Atomic size will be CONSIDERED while comparing the basicity of `NH_(3)` with other hydrides of group - 15 elements. |
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